/*
* Copyright © 2015 Cask Data, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package co.cask.cdap.data.stream.service.upload;
import co.cask.cdap.data.stream.service.ConcurrentStreamWriter;
import co.cask.cdap.data2.transaction.stream.StreamConfig;
import co.cask.cdap.proto.Id;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import java.io.IOException;
import java.util.Map;
/**
* A {@link ContentWriterFactory} that creates {@link LengthBasedContentWriter} that buffers write requests in memory
* until a threshold and then switches to writing events to file directly.
*/
public final class LengthBasedContentWriterFactory implements ContentWriterFactory {
private final StreamConfig streamConfig;
private final ConcurrentStreamWriter streamWriter;
private final Map<String, String> headers;
private final long bufferThreshold;
public LengthBasedContentWriterFactory(StreamConfig streamConfig, ConcurrentStreamWriter streamWriter,
Map<String, String> headers, long bufferThreshold) {
this.streamConfig = streamConfig;
this.streamWriter = streamWriter;
this.headers = ImmutableMap.copyOf(headers);
this.bufferThreshold = bufferThreshold;
}
@Override
public Id.Stream getStream() {
return streamConfig.getStreamId();
}
@Override
public ContentWriter create(Map<String, String> headers) throws IOException {
Map<String, String> allHeaders = Maps.newHashMap(this.headers);
allHeaders.putAll(headers);
return new LengthBasedContentWriter(streamConfig, streamWriter, allHeaders, bufferThreshold);
}
}